Double-Layer Model Analysis of Elastic Scattering of Complex Nuclei

Abstract

Heavy ion elastic scattering is analyzed in terms of the double-layer model which gives emphasis on the separation of the interaction region between complex nuclei into two parts: a surface region described by an optical potential and an absorptive interior region which is replaced by a boundary condition at the boundary of the two regions R′. In this model, lower partial waves can be modified by the boundary condition while higher ones are determined mainly by the optical potential in the surface region. A backward rise with a prominent oscillation in the angular distribution is well reproduced due to the effective contribution of the lower partial waves. The inner limit of the surface region R′ can be well determined and the logarithmic derivative of an incoming wave -iKR′ is confirmed to be an appropriate boundary condition.